postgres清理pg

方法一：
1.关闭postgres
/usr/local/pgsql/bin/pg_ctl stop -D /data/postgres/data
2.查询NextXID和NextOID
/usr/local/pgsql/bin/pg_controldata -D /data/postgres/data/

[postgres@mylinux]$ pg_controldata -D /data/postgres/data/
pg_control version number:            942
Catalog version number:               201510051
Database system identifier:           6625777092142108123
Database cluster state:               shut down
pg_control last modified:             Fri 17 May 2019 09:35:49 AM CST
Latest checkpoint location:           14/69000028
Prior checkpoint location:            14/68D758F8
Latest checkpoint's REDO location:    14/69000028
Latest checkpoint's REDO WAL file:    000000010000001400000069
Latest checkpoint's TimeLineID:       1
Latest checkpoint's PrevTimeLineID:   1
Latest checkpoint's full_page_writes: on
Latest checkpoint's NextXID:          0/13210704
Latest checkpoint's NextOID:          2553940
Latest checkpoint's NextMultiXactId:  1
Latest checkpoint's NextMultiOffset:  0
Latest checkpoint's oldestXID:        1820
Latest checkpoint's oldestXID's DB:   1
Latest checkpoint's oldestActiveXID:  0
Latest checkpoint's oldestMultiXid:   1
Latest checkpoint's oldestMulti's DB: 1
Latest checkpoint's oldestCommitTsXid:0
Latest checkpoint's newestCommitTsXid:0
Time of latest checkpoint:            Fri 17 May 2019 09:35:48 AM CST
Fake LSN counter for unlogged rels:   0/1
Minimum recovery ending location:     0/0
Min recovery ending loc's timeline:   0
Backup start location:                0/0
Backup end location:                  0/0
End-of-backup record required:        no
wal_level setting:                    hot_standby
wal_log_hints setting:                off
max_connections setting:              1000
max_worker_processes setting:         8
max_prepared_xacts setting:           0
max_locks_per_xact setting:           64
track_commit_timestamp setting:       off
Maximum data alignment:               8
Database block size:                  8192
Blocks per segment of large relation: 131072
WAL block size:                       8192
Bytes per WAL segment:                16777216
Maximum length of identifiers:        64
Maximum columns in an index:          32
Maximum size of a TOAST chunk:        1996
Size of a large-object chunk:         2048
Date/time type storage:               64-bit integers
Float4 argument passing:              by value
Float8 argument passing:              by value
Data page checksum version:           0

查到的NextXID和NextOID分别为13210704，2553940
3.删除pg_xlog
/usr/local/pgsql/bin/pg_resetxlog -o 2553940 -x 13210704 -f /data/postgres/data/
4.启动postgres
/usr/local/pgsql/bin/pg_ctl -D /data/postgres/data -l /data/postgres/log/pg_server.log start &
方法二：
删除00000001000000140000006F之前的日志
/usr/local/pgsql/bin/pg_archivecleanup . 00000001000000140000006F

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